On Aug 8, 2010, at 8:08 PM, Jake Anderson wrote:

> They aren't that hard to blow yourself

Yes; I've seen scuba divers blow air rings.  Usually straight upward, =20
and without any of the fine control that the dolphins show.

A really interesting question is whether the dolphins got to observe a =20
human blowing air rings before they tried it themselves...

BillW

--=20
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